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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c319104baeb0b06373cca5ba33acea57668fa17d42eef3d0463ec7fd71928a' 
  AND token = 'nN5U3Ldm8oWIA2LvIoSWwsH/fumw6E02+q6v3VqV1Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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