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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9353cd3333a2451fd563c34362e14e5f16b3809b9dd4c02a79961b1489f4439' 
  AND token = 'kzKeEcCwWI+QqM+5uvZR0JfeOvTME+VHtHtZfV91GuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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