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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b777871a60ebd24e5e03ee215a343a495c2f6e1dd0da6cc4a002286481d8ea12' 
  AND token = '7XnfrZerujXObNWrVHNjTUnfLfbISunE8FoRHdxZZTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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