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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72902fa1a42b56886edc1db940d06c7b3e8791a001b24f3aaf9603a385cde02f' 
  AND token = '7lDLwEGE4bBCHOI6obITXDG4+raNHw2odQk9idnSfDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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