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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee203f9a1d53774fdc670654061181534fdae6535698ba54bea6a16389320e9' 
  AND token = 'tuR91FqTYoAgZ35BR8lPqzU1fb3/WAQjOAj7bHBJsQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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