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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6b3fb8f66bacc886fad8842e85f59b8f321e68d2e98c482e325bd9a4202aed' 
  AND token = 'OqnXVjVisbYWhffLAGXdvq7dPCSh6KW7Il2OBQ3yNkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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