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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fa86fa4411a95d059438918043625fedf6d97788dc65ca7017748ba6a9511b' 
  AND token = 'xPqosmZalmthgw5HJKb6t8dYgauYdlHApx91tGSKcNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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