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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14562e9e14980a50683aa949f389032bff373e6d84e9f435f81cdf7574ad2e4a' 
  AND token = 'c3aZvBuwHarsWVgYsc4+wAw1cbEn7aCmWO4IIva9h4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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