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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c999b5a63d2b01d5a1e533faad944f31f8c8fcdfe6c75475dfecb6c9770b545' 
  AND token = 'C7990/SRr/Tne2aPZHUTrRhNU3vdvtxoT5cT+QPY+PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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