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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205beeb876b7956f1a1403e3dcdd3101365ead576043f0f47bef984b0d78793c' 
  AND token = 'ZflGTqPKcsmKkmFZ+xu0CSGqUnOMPJOv3HC3MU8Tf+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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