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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f3b6987aa738f0f53a5c21d3737cb22dbe5f3f02e0ab0fae863c5dd6ccd322' 
  AND token = 'w/AnaOV8eGkweljZN3LzGx8X8GqQhRYQ3WT0K2P9bvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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