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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdad7fe420e86169b96368ab9f09bedd1ad4decc289991ae81111ad287702e2e' 
  AND token = 'D0n+kjJv1qct8zAaMsVEYcNuMBqQHGlw/adbctcWe+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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