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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092e0b04324ba1d5939be057ab6f2df9b1ca882a1c64f0b20019e91a706c3a53' 
  AND token = 'nrEEKjPofwTzBEh2imm8rcPuO+rEFKUgNC12bpX0MXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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