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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235b5b758d428e7e1b6d00f8d7a4d24e8b1c04a621f35e4270db06d8b0ac19e0' 
  AND token = 'YH4KZH1bE4HF984sJbJFrzENLtlH0rOwKffGbGE/VCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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