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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa2142ef78373c50cc028f740e888f7611d185fa3052d5285397ef9fed3a8d3' 
  AND token = 'ptjBm24mLQwFEK3LNVowUjzaZ6vsPesbIAVKpwo4zeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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