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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a211306eb8ea4816e6704b2ff70df05e379700ac79531ff894b01c4c2b7da233' 
  AND token = 'WO/zG5iwoOGP2pdl8o9k5A+mgIyGB/pzCRBi2UTO8EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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