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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fca05d34c6ea7587613d46fce1b68966a0f900b0af95d158ee92c95a8eed506' 
  AND token = '+81wC8k6D5yyaCy85rUn1giPS15aJFpxEvewINjjB3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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