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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5854b3053ce4d7b3479106f69f30f0d121eeb4eeb9a1ac4f4f76cafc0cd6574' 
  AND token = '1+9Lm0fB6ZOVngDnKgHzCDQgNEtM64rInwqeci6xP+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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