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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fa01d47a334fd91bcf2ad9db9c63a94af0360382a388861c01710f972c3f11' 
  AND token = '0qGaxKic3BxrnrnF6+k2s3v93VfVg/5W+ruf/V1QJX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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