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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ce53779d9116c5b03614517b49a5891286dc9096a737f2c8a98249f8b9fdd3' 
  AND token = 's/MfyL3EyKnsXNBC/XfB5/7ENx4c00gnVRSy90ehzyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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