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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8183ea92d98af92c95ed817934776a29d5f6b6146974dde453846b576c53838' 
  AND token = '8Mtczg/K5MPshnnBm56m8GrMZuBYmjep9nb6oKnxkx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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