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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7506f926b07d997c703872b3b64c1d2e671c270a4121ab935677b60d24fb0611' 
  AND token = 'PS09bPPdywfzpM7LHHzVnPla1x75ntO4EvPJq+M3I9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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