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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfdb3e46df48697c4c53900ca29d89dab0d0d4ce7ece2bbe527be88dcaa33bd' 
  AND token = 'G+dNhofHBiExlwVwS35a21rFEqp9ue6mr8QqZLgU31c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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