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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0130f270bde3e118f26e3f839dac7c0e93b067d68283c4e26a820477e29c13a8' 
  AND token = 'RMokDUzyVczCryD1/WYSdd3a3aXmV08hLMW1i/6aIWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}