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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51c4b9464e28cfe93143bdf81d68a49699a420412cb731aeb88f4a3e69399ef' 
  AND token = 'pbtFSQOBHPppJrG5tGV0p3ACp9+yT6gKgpb+WAC78b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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