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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d515c295aed038e5a6e266538f64abd7bafb7cbc701593cdfbb2d3403d6b48' 
  AND token = '+wmlEAEkMVYr9gPuExjq6luSQSCwv4gY6KxT9S8tjyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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