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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8366c7a9a22b7ae3c3c04f5f521327cd2431dce69253d037f4d2ea989d4f55' 
  AND token = 'hbUaOFUCV26DAHTGzCMneodIDACG7AdKLV4OK6nfI1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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