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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a082869dd907f7b4e5b61b5cf7d300e58f8279b896c467c58290dde0f5fde03' 
  AND token = 'LJJsHRn1pCOF9MTuFe1UfNv20ch1Qec9OGqypM/dJpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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