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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3108a94384b920ea2b046b184fe5ea713ba5759b371bedf1922a76de19559c84' 
  AND token = '4AR3+TAiv/c/jbXYy28bcSHbyY1XIg9MDf60ZeG3r/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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