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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a305fb67d1f6f1fde446125b1188662cb6ef1ef7a0bb902de419f1703a5b9e2c' 
  AND token = 'bpKUvCbJL+eHWDSFSeC0VhKgHvjLrN4NzoM1G9gQ4VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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