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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47ed4cc58cb148c137625a7551a042b76245e37dcd13f82ee5b95f933f04256' 
  AND token = 'wsjaQ3Z3DXyYCOqc6f4F89sB6WO8hQmSiKdCCQyUh9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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