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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ef5ff4dac95d137981fc14e2f2bedd46be6c85c8593491baaa76ce91e26d83' 
  AND token = '8SO98BiLh7gr2KIU0PB11H328ZpI+yu8wMDko0I8arE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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