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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158c0752fb6c14d2ac97909742f83c7d96ce82074d46c8f0b96c167a90389fcf' 
  AND token = 'rxFxd6ksae8cuFTqR8Q56bjRbIkoVTWi6f4LM89FY48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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