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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44e4cace4735101e91c704d8028f3f61044157451cc4da9b09b5ab9b7cb7fc2' 
  AND token = '9TRBG1DV/+0p5Wa95dOOBmx2MbBgS2WnEcP+lKFHH0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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