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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a11198a61711f7750c8a9b2145f2f4cbf61d74e2e6e750e12a60179b0d8d4f' 
  AND token = '5z4k+BdM8NLy/b8DbX2GgCXNSGJWe+wupSu7t0FdT2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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