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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e5092b0d39fea52c3424cd8c654267beafdd46c1cf3c716c3c203dda9211a1' 
  AND token = 'CQU3s5yn96FVbEBzpsf7Flkw2Fj+Un6X16evQFXpT3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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