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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda52986097fa21eef68ebefb2dd2aa97408e558736d5b4b4d3466233c643f85' 
  AND token = '6zPnqceWZWjx13OpmRYS5Vac491uDndcx2cUbXLOYxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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