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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e851b3391697b4421fb16ffa1fb3225df5ccedcb2cee4f61c76ae2bd86172b' 
  AND token = 'vk2PkzqcteKF6afP1LE2pwLT3/sIdl/1h90yTzhsn3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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