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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e829acddf10e6a0dfec972cfe46c5c1260d081c4f693f18e68a5e63ef3ff4c1' 
  AND token = 'mbe66G6zRqr7OWo7dpEbZvsRlyTZ34m60j0drKkeX2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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