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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbcf816767395e0c58959161879ecab4d71025491250bf12e5aac4f103a2787' 
  AND token = '0MWn3LbJfrDjUfEdAbgd1y/L0AoGTSOMbVKjV9TU4gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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