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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6209eec449fe413c9d8e78e37a4ed07fc1bf340e81c13737fcc39ea76a318594' 
  AND token = 'QmZaqwt4tIgBRlu34RqkqjKAh6+dhCxQOTtHzDo8Uig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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