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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d187316ee4e8fbc3e8ac776a7be05bd13aedb6fe12ea865c08b65b8077deb5' 
  AND token = '14NydNW1ttZpwWytaEEIjjmVQOO2YpQqtdWf6ijKpsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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