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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80816d479bafbbee5885677020c442a4f110d81b2623b530994572613d08432' 
  AND token = '9BjF2URzDnSMRIa5VRrJWB1eykB0iZWCeBGPTf6w8dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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