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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1d58885398d1f41a93e9a47d85c1cd0715ee45bd22f2db7132cd83ffb1b0c4' 
  AND token = 'WuSUDFu8921ucMaNsPT2peK9l8K39PgbZBz18Vex344=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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