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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f9534fa4bc3f0f207e304f1a60495f985cac47eb364fc9e8d9b77d394c3405' 
  AND token = '9zb++53IXQf27HKOJKs+apCC+kDvZKisiSdzqdQ6LeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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