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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bd7b2056acbe92eca78f296ebeb374ceee09987b89b09862669d18701847c3' 
  AND token = 'YgJOGHTCsUKeVjQGbVVP1M+KKjuI9m2P7poLshU9nCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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