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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72cf7c01ab15083c1f60353378d50aa525353b318b625d68f086a600dedeb08' 
  AND token = 'UmCGF7MGDdQPhrHhqhNUpANQxdjCkn9oDhf7Gkluv6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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