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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c450934b31dc43fb6d8ef936af870329d7a3957e61965592c80e34fc7cf0e95' 
  AND token = 'B1RdeRtzRKwk194gEMHxhcrcTKEdw5tus0dhBDd17ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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