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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ea48dd15d27889db1337d61576d67f3ec170afeaffe8fc4970602dcf22d48e' 
  AND token = 'nyb8JwJ4PrbDk655ZX2zu7J2kVhNm1Fo5+8Li4F5HXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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