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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ce7170b74800a0a95a0d85c2e2493a694ac9e635d105085c35d47f494185e1' 
  AND token = 'LQeOupXB6wHIIiK16SZCdGCK/gPr9pfp7kDiNFKJMdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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