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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd669c57ae2eb15f7165469d11e08f882f8ad0fd487fcb648353703b13d738f' 
  AND token = 'pY+H7qnH8T2fLidy4O4X3515DfMj+cYJ8Jx+nUrwro0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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