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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bcfbde85a38655d74818d75e2affb6e421800aeca2d8433224745693881232' 
  AND token = 'WXP8Xfxx9wGJAE4wxsxvrbGsIG37SHcn5nvtcFtmoK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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