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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d67d1ca98da3df91e50530653598caaf71cd1d98b6d1e3fdf780e974ccd2c9' 
  AND token = 'CrSjlzHdh1fuoyQOennGAXtaSKLKhFSbPEOLSJS1SAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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