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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42117da3d537d68927ed3b67387dae75e2c82be590a4b48b4cfc0126a55f236a' 
  AND token = 'rGskTHHofbguo2MeqBDYg1ez45FZTFmW/qAoUPgouds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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