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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f45f6c4dd835bb6da87dca67a7a1df01dd3ae8447ef3b28f367e4ebeb5380e' 
  AND token = 'jsA9EZ3DoChWbjL0MAdwMyCHRAxopFh+u/7n1hYGH2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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