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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fded3bace668d7b2047edd60ffed092f0b1c8d5dbddbde7340fc10925ab643f0' 
  AND token = 'wdbWX3ErLowQhP9hPbrqGGRZlcWgzRYIJkHWdL2iy7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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