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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd00c29f0c4a02fd38b56d3f7efcf0e7d0ad9d0bcc927d310282c4b5be6fdeba' 
  AND token = 'PWsa/UGlTGDYC7SrLrnMfOal4sWHNoTy0cuxgr8U/os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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