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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6736f6acc0479c585fc0409f7fdd40f6f4733c7179eca1d964085eacde8ac8' 
  AND token = 'OeBTEW5h4zRtxLVF9IgFOXNXPvhVH+d+ehDkj+2Y+rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00179

JSON explain

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