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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55a20e81b977aeefd650d1998860986aa58160cf705f080812b6cf4c13e77fe' 
  AND token = 'okc0Ucwcq7MKXLk5IpM9HCzBg+KooSA0lnklnDOsmrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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