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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbf6a9b4ef227490edae39a0997accb8d9f2e203a3b449caf0c0b5e5efe97fa' 
  AND token = 'eev+xyoPLugPkCOBNYZ1RoafRt0H/82UQTGxmdD1R/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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