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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f29ec063c4de547638ef4fd640ed7464a7defa9c2a64a973df1630470b5d95' 
  AND token = 'r0p8BUS5qPmrxLXhXkWI14jdXxyLAkhtJjNUBWslNn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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