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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048d33add721e0169226928d8f8a6a5c74359b4733e394020a4d104436d870b2' 
  AND token = 'Qwc5jlD4QXfJCoV4/JW161L//uTizrvosQgQ8iwIif8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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