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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2a862a4dd41aba7b724231cda749dadcae727827ac848292a3164fd6550a2b' 
  AND token = 'M2EYxz4kFRH0ZvcNmQFxL4Ia1HMs8/Tjcyv5V3MI8Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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